Computer Somnolence Can Spending Too Much Time In Front Of The Computer Cause Drowsiness And Somnolence?

Can spending too much time in front of the computer cause drowsiness and somnolence? - computer somnolence

For more than a month, since I'm away from the computer. The first night I spent in the line after that I was very tired after only 30 minutes from your computer.
Generally about 7 hours per day to spend online.

1. Thus, this causes my constant somnonlence?
2. If so, what will develop in this direction?
3. May deteriorate with time?
4. What must I do to stop this?